Package org.apache.flink.streaming.runtime.tasks

Interface SubtaskCheckpointCoordinator

All Superinterfaces:

AutoCloseable, Closeable

@Internal
public interface SubtaskCheckpointCoordinator
extends Closeable

Coordinates checkpointing-related work for a subtask (i.e. Task and StreamTask). Responsibilities:

1. build a snapshot (invokable)
2. report snapshot to the JobManager
3. action upon checkpoint notification
4. maintain storage locations

Method Summary

Modifier and Type	Method	Description
void	abortCheckpointOnBarrier(long checkpointId, CheckpointException cause, OperatorChain<?,?> operatorChain)
void	cancel()	Cancel all resources.
void	checkpointState(CheckpointMetaData checkpointMetaData, CheckpointOptions checkpointOptions, CheckpointMetricsBuilder checkpointMetrics, OperatorChain<?,?> operatorChain, boolean isTaskFinished, Supplier<Boolean> isRunning)	Must be called after initInputsCheckpoint(long, CheckpointOptions).
ChannelStateWriter	getChannelStateWriter()
CheckpointStorageWorkerView	getCheckpointStorage()
void	initInputsCheckpoint(long id, CheckpointOptions checkpointOptions)	Initialize new checkpoint.
void	notifyCheckpointAborted(long checkpointId, OperatorChain<?,?> operatorChain, Supplier<Boolean> isRunning)	Notified on the task side once a distributed checkpoint has been aborted.
void	notifyCheckpointComplete(long checkpointId, OperatorChain<?,?> operatorChain, Supplier<Boolean> isRunning)	Notified on the task side once a distributed checkpoint has been completed.
void	notifyCheckpointSubsumed(long checkpointId, OperatorChain<?,?> operatorChain, Supplier<Boolean> isRunning)	Notified on the task side once a distributed checkpoint has been subsumed.
void	waitForPendingCheckpoints()	Waits for all the pending checkpoints to finish their asynchronous step.

Methods inherited from interface java.io.Closeable

close

Method Detail

initInputsCheckpoint

void initInputsCheckpoint(long id,
                          CheckpointOptions checkpointOptions)
                   throws CheckpointException

Initialize new checkpoint.

Throws:

CheckpointException

getChannelStateWriter

ChannelStateWriter getChannelStateWriter()

getCheckpointStorage

CheckpointStorageWorkerView getCheckpointStorage()

abortCheckpointOnBarrier

void abortCheckpointOnBarrier(long checkpointId,
                              CheckpointException cause,
                              OperatorChain<?,?> operatorChain)
                       throws IOException

Throws:

IOException

checkpointState

void checkpointState(CheckpointMetaData checkpointMetaData,
                     CheckpointOptions checkpointOptions,
                     CheckpointMetricsBuilder checkpointMetrics,
                     OperatorChain<?,?> operatorChain,
                     boolean isTaskFinished,
                     Supplier<Boolean> isRunning)
              throws Exception

Must be called after initInputsCheckpoint(long, CheckpointOptions).

Throws:

Exception

notifyCheckpointComplete

void notifyCheckpointComplete(long checkpointId,
                              OperatorChain<?,?> operatorChain,
                              Supplier<Boolean> isRunning)
                       throws Exception

Notified on the task side once a distributed checkpoint has been completed.

Parameters:

checkpointId - The checkpoint id to notify as been completed.

operatorChain - The chain of operators executed by the task.

isRunning - Whether the task is running.

Throws:

Exception

notifyCheckpointAborted

void notifyCheckpointAborted(long checkpointId,
                             OperatorChain<?,?> operatorChain,
                             Supplier<Boolean> isRunning)
                      throws Exception

Notified on the task side once a distributed checkpoint has been aborted.

Parameters:

checkpointId - The checkpoint id to notify as been completed.

operatorChain - The chain of operators executed by the task.

isRunning - Whether the task is running.

Throws:

Exception

notifyCheckpointSubsumed

void notifyCheckpointSubsumed(long checkpointId,
                              OperatorChain<?,?> operatorChain,
                              Supplier<Boolean> isRunning)
                       throws Exception

Notified on the task side once a distributed checkpoint has been subsumed.

Parameters:

checkpointId - The checkpoint id to notify as been subsumed.

operatorChain - The chain of operators executed by the task.

isRunning - Whether the task is running.

Throws:

Exception

waitForPendingCheckpoints

void waitForPendingCheckpoints()
                        throws Exception

Waits for all the pending checkpoints to finish their asynchronous step.

Throws:

Exception

cancel

void cancel()
     throws IOException

Cancel all resources.

Throws:

IOException